Normally I'd say "hard pass." I'm pretty comfortable with static types being a model where the compiler throws the type information away at compile time, so I c

Normally I'd say "hard pass." I'm pretty comfortable with static types being a model where the compiler throws the type information away at compile time, so I can type with abandon without worrying that I'm going to impact runtime performance in my generated code. ... TypeScript may be one exception to my rule of thumb. It's already compiling down to JavaScript, so you're already paying a performance tax in having your code run in an interpreted language. The question should be "how much more of a performance tax are you paying annotating things with type runtime metadata?"